Tomaz Canabrava a0c396f5cf Don't clear the underline model of the combobox
Clear was the right method to call when we used a line edit, and the line
edit didn't had a model to provide data. Calling clear() on a QComboBox
will delete all itens inside of it, and what we wanted was to choose an
invalid index - and that's -1

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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